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Introduction to the high energy cosmic-radiation detection (HERD) facility onboard China's future space station
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2017 (English)In: Proceedings of Science, Sissa Medialab Srl , 2017Conference paper, Published paper (Refereed)
Abstract [en]

The High Energy cosmic-Radiation Detection (HERD) facility is one of several space astronomy payloads onboard China's Space Station, which is planned for operation starting around 2025 for about 10 years. The main scientific objectives of HERD are searching for signals of dark matter annihilation products, precise cosmic electron (plus positron) spectrum and anisotropy measurements up to 10 TeV, precise cosmic ray spectrum and composition measurements up to the knee energy, and high energy gamma-ray monitoring and survey. HERD is composed of a 3-D cubic calorimeter (CALO) surrounded by microstrip silicon trackers (STKs) from five sides except the bottom. CALO is made of about 7,500 cubes of LYSO crystals, corresponding to about 55 radiation lengths and 3 nuclear interaction lengths, respectively. The top STK microstrips of six X-Y layers are sandwiched with tungsten converters to make precise directional measurements of incoming electrons and gamma-rays. In the baseline design, each of the four side STKs is made of only three layers microstrips. All STKs will also be used for measuring the charge and incoming directions of cosmic rays, as well as identifying back scattered tracks. With this design, HERD can achieve the following performance: energy resolution of 1% for electrons and gamma-rays beyond 100 GeV and 20% for protons from 100 GeV to 1 PeV; electron/proton separation power better than 10-5; effective geometrical factors of >3 m2sr for electron and diffuse gamma-rays, >2 m2sr for cosmic ray nuclei. R&D is under way for reading out the LYSO signals with optical fiber coupled to image intensified IsCMOS and CALO prototype of 250 LYSO crystals. 

Place, publisher, year, edition, pages
Sissa Medialab Srl , 2017.
Keywords [en]
Cosmic ray measurement, Cosmic rays, Cosmology, Electrons, Germanium compounds, Optical fibers, Space stations, Anisotropy measurements, Annihilation products, Composition measurements, Directional measurement, Geometrical factors, Microstrip silicon tracker, Nuclear interaction, Scientific objectives, Gamma rays
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-236868Scopus ID: 2-s2.0-85046058950OAI: oai:DiVA.org:kth-236868DiVA, id: diva2:1270900
Conference
35th International Cosmic Ray Conference, ICRC 2017, 10 July 2017 through 20 July 2017
Note

QC 20181214

Available from: 2018-12-14 Created: 2018-12-14 Last updated: 2019-04-09Bibliographically approved

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Pearce, MarkRyde, Felix

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